US1615789A - Boiler - Google Patents

Description

1927' w. J. FISHER BOILER Filed March 8, 1924 Patented Jan. 25, 1927.

UNETED STA'l'Efi PATENT orricn.

WILLIAM J. FISHER, OF YORK, PENNSYLVANIA, ASSIGNOE TO A. B. FARQ'UI-IAR CO.

LTD, OF YORK, PENNSYLVANIA, A LIMITED PARTNERSHIP OF PENNSYLVANIA.

BOILER.

Application filed March 8, 1924. Serial No. 697,905.

This invention relates to boilers of the in ternal furnace tubular type, and has particular relation to the inner construction of the rear combustion chamber thereof.

The primary object of this invention is the provision of an improved lining for the rear combustion chamber of an internal furnace tubular boiler.

Another object of this invention is the provision of an improved metallic lining for the rear combustion chamber of such a boiler.

Another object of my invention is the provision of an improved metallic sectional perforated lining for the rear combustion chamber of such a boiler.

Another object of my invention is the provision of an improved means for securing doors to the end of combustion chambers of certain types of boilers.

Another and further object of my invention is to provide an improved means for securing the lining to the combustion chamber wall, which means will minimize the coipduction of heat from the lining to the wa 1.

Other and further objects will be app-an ent, from the specification, to those skilled in the art.

Referring to the drawing wherein I have illustrated a preferred embodiment of my invention:

Fig. 1 is a perspective view of my invention as applied to a boiler showing the doors of the rear combustion chamber open;

Fig. 2 is a longitudinal sectional view of a boiler having my invention applied thereto, and

Fig. 3 is a fragmental detail view of the outside of the boiler showing the side of the boiler at the rear combustion chamber end.

Like reference characters refer to similar parts throughout the several views.

In the drawing, 10 designates the shell of the boiler, 11 the steam dome and 12 the smoke stack.

The numeral 15 designates the rear combustion chamber, 16 the fire box or internal furnace, and 17 the tubes. The fuel is placed in the fire box 16. The smoke and hot gases pass to the right, as shown in Fig. 2 into the rear combustion chamber 15 and return through the tubes 17 to the stack 12 from whence they escape into the air.

spaced lugs 41 cast therewith for cooperation and coaction with the lugs 11*. A bolt 41 passes through the lugs ll and 41 and constitutes, therewith, the hinge. The lugs 41 are spaced so that they will rest, each on its corresponding lug 11 v The rear combustion chamber at its outer and cylindrical side and at its outer end, is provided with a suitable metal lining which I preferably make of cast iron and in sections.

The upper portion is made preferably in two sections 25, 26 as shown in Fig. 1. These two sections are preferably flat and are located on a lower level than the steam spacein order to protect the end ofthe boiler at this point. The sections 25 and 26 are provided, respectively, with flanges 25, 26 to co-operate with and overlap adjacent sections, thus providing for expansion and easy installation. These sections 25, 26 are held in spaced relation to the cylindrical shell 10 of the boiler by suitable spacing lugs 25, 26, 25 26 of which there are two each for each plate. These spacing lugs may be made separate from or integral with their respective sections. I prefer, however, to make them integral and have so shown them.

Suitable bosses 25, 26 are provided for the respective sections and are integral therewith. These bosses are provided with threaded studs 25, 26 cast therein. These studs 25 and 26, pass through the outer shell of the rear combustionchamber, where nuts 25 and 26 hold them in place.

Spaced around the boiler from the section 26 are other segmental sections which conform to the cylindrical surface of the rear combustion chamber, but in spaced relation therefrom. These sections I have designated 30, 31, 32, 33, 34, 35 and 36. Each of these sections is provided with an overlapping flange corresponding to the flanges 25 and .26 and mean POSltLOIltO overlap.

the adjacent sections. Each of these sections" is also provided with suitable means-forholding the sections in a" spacedmelationfrom the outside wall of :the: rear combustion chamber. I have shown spacers such as the blocks or lugs 30, 32, 33 34 for:

the respective sections to prevent contact with the shell. I also-provide bosses for the respective sections as shown at 32. and.

33 and cooperating studs SQ and 33, similar to the studs 25 and 26, to hold the sections in place.

Ih'ave found that.a construction which isvery satisfactory is one in 'whiclrthe sections 25, 26; 30, 31, 32,133, 34, 35, 36" are each provided with two bosses with their corresponding studs to hold the plates in position andlare so constructed that the bosses will hearranged on to the axis ofthe boiler andspaced from the end of their respective sections It is to he noted thatthe lugs and bolts furnish.

very little metallic cross-section through which heat canbe conducted.

Fixed to the doors 18 and 19, respectively, are the liner sections'37l and '38. One of these sections, .as. 38, is provided. with an. overlapping. flange, as. shown. at 39, for cooperation withkthe adjacent'edge of the complementary section 37.

The upper edge ofthe sections 37," 38 are ofla height'to pass undenthe sections 25, .26, thedatter extending over the sections 37, 38when the doors are closed.

These sections 37 and '38 are provided with spacing lugs as shown at 3T", similar to ,thelugs 25, 26'-andare shown as being integral with the. door. Studs 37 38 are provided with suitable bosses'as indicated at 37.. in Fig. 2 and secure the sections 37, 38,-respectively, to their doors.

The sections 37rand 38 are provided, respectively, with integral extensions 37 38? which extend fromwthe main bodies ofthe sections at such an angle that they will clear the hinge plates 40, tlwhen the doors are closed. These extensions 37 38 have areuate edges which, when the doors are closed,;,

willb be in close proximity .to the sections 30, 31, and T36, 35 and Set-respectively.

In ordercto prevent warping,each of the liningwsections 25. 26,- 30, 31, 32, 38, 34,;

35, .36, 3?..and138 "is preferablyperforated' as shown inthe drawing, I

It is thusiclearzthat .Ifhaveprovided an efiicient rear. combustion. chamber.- lining which. from 1 its construction will protect the shell of 'therear. combustionchamher, is easy to install. and which has provision. for

line parallel expansion and contraction and is so constructed as to permit a minimum ofwarpage due to temperature"changes.

\Vhi-le' I have shown and described in detail an embodiment of my invention, I desire to .have 'itunderstood that I do not limit myself to the exact showing and that modifications and changes may be made without departing from the spirit of my invention and within the scope of the appended claims.

Having described my invention, what I claim is l. A boiler having a combustion chamber having an air cooled outside'wall, a lining therefor, the lining, being; spaced wholly from. the wall of the combustionchamber andmeans for holding the lining in position in spaced relation to the combustion chamber wall, the space'between the lining and wallbeingco-extensive with the lining, said means having very small contacting surface with the wall wherebythe conduction of 'heat from the lining to the outer wall is minimized, the upper portion of'thc lining extending across the chamber adjacent the level of the lower portion of the steam space of the boiler.

2. A boiler having a combustion chan'iber,

chamber, the space between the lining and wall extending throughout the axial length of the lining and means for holding the linmg in position in spaced relation to the combustion chamber wall, said means being of a .shape and so placed as to permit ofa free air or gas communication between'the spaces outward of adjacent lining sections, the upper lining sections extending across the chamber adjacent the level of the lower portion of the steam space of the boiler.

3.'A. chamlier, hinged doors for closing the end thereof, a lining for the rear combustion chamber, said lining comprising perforated sections about the cylindrical side and perforated sections on the doors, thesections about the cylindrical side having portions overlapping adjacent. l'QSlDECblVQ sections. the doorsectious cooperating with the sections about the cylihdnical side of the rear combastion chamber, the door sect-ions having portions at an angle to the main-bodytherm of 'and means for spacedly holdingthe liningsections from. the wall and doors, respectively.

lnitestirnony whereof I hereunto aflix my signature.

WILLIAM FISHER.

boiler having a rear combustion

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